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Merge branch 'kvm-updates-2.6.26' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6/lfs.git] / net / xfrm / xfrm_user.c
blob22a30ae582a2738cc8453fcdefe1893caa1b6263
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <asm/uaccess.h>
30 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
31 #include <linux/in6.h>
32 #endif
33
34 static inline int aead_len(struct xfrm_algo_aead *alg)
35 {
36 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
37 }
38
39 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
40 {
41 struct nlattr *rt = attrs[type];
42 struct xfrm_algo *algp;
43
44 if (!rt)
45 return 0;
46
47 algp = nla_data(rt);
48 if (nla_len(rt) < xfrm_alg_len(algp))
49 return -EINVAL;
50
51 switch (type) {
52 case XFRMA_ALG_AUTH:
53 if (!algp->alg_key_len &&
54 strcmp(algp->alg_name, "digest_null") != 0)
55 return -EINVAL;
56 break;
57
58 case XFRMA_ALG_CRYPT:
59 if (!algp->alg_key_len &&
60 strcmp(algp->alg_name, "cipher_null") != 0)
61 return -EINVAL;
62 break;
63
64 case XFRMA_ALG_COMP:
65 /* Zero length keys are legal. */
66 break;
67
68 default:
69 return -EINVAL;
70 }
71
72 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
73 return 0;
74 }
75
76 static int verify_aead(struct nlattr **attrs)
77 {
78 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
79 struct xfrm_algo_aead *algp;
80
81 if (!rt)
82 return 0;
83
84 algp = nla_data(rt);
85 if (nla_len(rt) < aead_len(algp))
86 return -EINVAL;
87
88 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
89 return 0;
90 }
91
92 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
93 xfrm_address_t **addrp)
94 {
95 struct nlattr *rt = attrs[type];
96
97 if (rt && addrp)
98 *addrp = nla_data(rt);
99 }
100
101 static inline int verify_sec_ctx_len(struct nlattr **attrs)
102 {
103 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
104 struct xfrm_user_sec_ctx *uctx;
105
106 if (!rt)
107 return 0;
108
109 uctx = nla_data(rt);
110 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
111 return -EINVAL;
112
113 return 0;
114 }
115
116
117 static int verify_newsa_info(struct xfrm_usersa_info *p,
118 struct nlattr **attrs)
119 {
120 int err;
121
122 err = -EINVAL;
123 switch (p->family) {
124 case AF_INET:
125 break;
126
127 case AF_INET6:
128 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
129 break;
130 #else
131 err = -EAFNOSUPPORT;
132 goto out;
133 #endif
134
135 default:
136 goto out;
137 }
138
139 err = -EINVAL;
140 switch (p->id.proto) {
141 case IPPROTO_AH:
142 if (!attrs[XFRMA_ALG_AUTH] ||
143 attrs[XFRMA_ALG_AEAD] ||
144 attrs[XFRMA_ALG_CRYPT] ||
145 attrs[XFRMA_ALG_COMP])
146 goto out;
147 break;
148
149 case IPPROTO_ESP:
150 if (attrs[XFRMA_ALG_COMP])
151 goto out;
152 if (!attrs[XFRMA_ALG_AUTH] &&
153 !attrs[XFRMA_ALG_CRYPT] &&
154 !attrs[XFRMA_ALG_AEAD])
155 goto out;
156 if ((attrs[XFRMA_ALG_AUTH] ||
157 attrs[XFRMA_ALG_CRYPT]) &&
158 attrs[XFRMA_ALG_AEAD])
159 goto out;
160 break;
161
162 case IPPROTO_COMP:
163 if (!attrs[XFRMA_ALG_COMP] ||
164 attrs[XFRMA_ALG_AEAD] ||
165 attrs[XFRMA_ALG_AUTH] ||
166 attrs[XFRMA_ALG_CRYPT])
167 goto out;
168 break;
169
170 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
171 case IPPROTO_DSTOPTS:
172 case IPPROTO_ROUTING:
173 if (attrs[XFRMA_ALG_COMP] ||
174 attrs[XFRMA_ALG_AUTH] ||
175 attrs[XFRMA_ALG_AEAD] ||
176 attrs[XFRMA_ALG_CRYPT] ||
177 attrs[XFRMA_ENCAP] ||
178 attrs[XFRMA_SEC_CTX] ||
179 !attrs[XFRMA_COADDR])
180 goto out;
181 break;
182 #endif
183
184 default:
185 goto out;
186 }
187
188 if ((err = verify_aead(attrs)))
189 goto out;
190 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
191 goto out;
192 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
193 goto out;
194 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
195 goto out;
196 if ((err = verify_sec_ctx_len(attrs)))
197 goto out;
198
199 err = -EINVAL;
200 switch (p->mode) {
201 case XFRM_MODE_TRANSPORT:
202 case XFRM_MODE_TUNNEL:
203 case XFRM_MODE_ROUTEOPTIMIZATION:
204 case XFRM_MODE_BEET:
205 break;
206
207 default:
208 goto out;
209 }
210
211 err = 0;
212
213 out:
214 return err;
215 }
216
217 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
218 struct xfrm_algo_desc *(*get_byname)(char *, int),
219 struct nlattr *rta)
220 {
221 struct xfrm_algo *p, *ualg;
222 struct xfrm_algo_desc *algo;
223
224 if (!rta)
225 return 0;
226
227 ualg = nla_data(rta);
228
229 algo = get_byname(ualg->alg_name, 1);
230 if (!algo)
231 return -ENOSYS;
232 *props = algo->desc.sadb_alg_id;
233
234 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
235 if (!p)
236 return -ENOMEM;
237
238 strcpy(p->alg_name, algo->name);
239 *algpp = p;
240 return 0;
241 }
242
243 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
244 struct nlattr *rta)
245 {
246 struct xfrm_algo_aead *p, *ualg;
247 struct xfrm_algo_desc *algo;
248
249 if (!rta)
250 return 0;
251
252 ualg = nla_data(rta);
253
254 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
255 if (!algo)
256 return -ENOSYS;
257 *props = algo->desc.sadb_alg_id;
258
259 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
260 if (!p)
261 return -ENOMEM;
262
263 strcpy(p->alg_name, algo->name);
264 *algpp = p;
265 return 0;
266 }
267
268 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
269 {
270 int len = 0;
271
272 if (xfrm_ctx) {
273 len += sizeof(struct xfrm_user_sec_ctx);
274 len += xfrm_ctx->ctx_len;
275 }
276 return len;
277 }
278
279 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
280 {
281 memcpy(&x->id, &p->id, sizeof(x->id));
282 memcpy(&x->sel, &p->sel, sizeof(x->sel));
283 memcpy(&x->lft, &p->lft, sizeof(x->lft));
284 x->props.mode = p->mode;
285 x->props.replay_window = p->replay_window;
286 x->props.reqid = p->reqid;
287 x->props.family = p->family;
288 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
289 x->props.flags = p->flags;
290
291 if (!x->sel.family)
292 x->sel.family = p->family;
293
294 }
295
296 /*
297 * someday when pfkey also has support, we could have the code
298 * somehow made shareable and move it to xfrm_state.c - JHS
299 *
300 */
301 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
302 {
303 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
304 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
305 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
306 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
307
308 if (rp) {
309 struct xfrm_replay_state *replay;
310 replay = nla_data(rp);
311 memcpy(&x->replay, replay, sizeof(*replay));
312 memcpy(&x->preplay, replay, sizeof(*replay));
313 }
314
315 if (lt) {
316 struct xfrm_lifetime_cur *ltime;
317 ltime = nla_data(lt);
318 x->curlft.bytes = ltime->bytes;
319 x->curlft.packets = ltime->packets;
320 x->curlft.add_time = ltime->add_time;
321 x->curlft.use_time = ltime->use_time;
322 }
323
324 if (et)
325 x->replay_maxage = nla_get_u32(et);
326
327 if (rt)
328 x->replay_maxdiff = nla_get_u32(rt);
329 }
330
331 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
332 struct nlattr **attrs,
333 int *errp)
334 {
335 struct xfrm_state *x = xfrm_state_alloc();
336 int err = -ENOMEM;
337
338 if (!x)
339 goto error_no_put;
340
341 copy_from_user_state(x, p);
342
343 if ((err = attach_aead(&x->aead, &x->props.ealgo,
344 attrs[XFRMA_ALG_AEAD])))
345 goto error;
346 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
347 xfrm_aalg_get_byname,
348 attrs[XFRMA_ALG_AUTH])))
349 goto error;
350 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
351 xfrm_ealg_get_byname,
352 attrs[XFRMA_ALG_CRYPT])))
353 goto error;
354 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
355 xfrm_calg_get_byname,
356 attrs[XFRMA_ALG_COMP])))
357 goto error;
358
359 if (attrs[XFRMA_ENCAP]) {
360 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
361 sizeof(*x->encap), GFP_KERNEL);
362 if (x->encap == NULL)
363 goto error;
364 }
365
366 if (attrs[XFRMA_COADDR]) {
367 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
368 sizeof(*x->coaddr), GFP_KERNEL);
369 if (x->coaddr == NULL)
370 goto error;
371 }
372
373 err = xfrm_init_state(x);
374 if (err)
375 goto error;
376
377 if (attrs[XFRMA_SEC_CTX] &&
378 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
379 goto error;
380
381 x->km.seq = p->seq;
382 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
383 /* sysctl_xfrm_aevent_etime is in 100ms units */
384 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
385 x->preplay.bitmap = 0;
386 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
387 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
388
389 /* override default values from above */
390
391 xfrm_update_ae_params(x, attrs);
392
393 return x;
394
395 error:
396 x->km.state = XFRM_STATE_DEAD;
397 xfrm_state_put(x);
398 error_no_put:
399 *errp = err;
400 return NULL;
401 }
402
403 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
404 struct nlattr **attrs)
405 {
406 struct xfrm_usersa_info *p = nlmsg_data(nlh);
407 struct xfrm_state *x;
408 int err;
409 struct km_event c;
410
411 err = verify_newsa_info(p, attrs);
412 if (err)
413 return err;
414
415 x = xfrm_state_construct(p, attrs, &err);
416 if (!x)
417 return err;
418
419 xfrm_state_hold(x);
420 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
421 err = xfrm_state_add(x);
422 else
423 err = xfrm_state_update(x);
424
425 xfrm_audit_state_add(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
426 NETLINK_CB(skb).sid);
427
428 if (err < 0) {
429 x->km.state = XFRM_STATE_DEAD;
430 __xfrm_state_put(x);
431 goto out;
432 }
433
434 c.seq = nlh->nlmsg_seq;
435 c.pid = nlh->nlmsg_pid;
436 c.event = nlh->nlmsg_type;
437
438 km_state_notify(x, &c);
439 out:
440 xfrm_state_put(x);
441 return err;
442 }
443
444 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
445 struct nlattr **attrs,
446 int *errp)
447 {
448 struct xfrm_state *x = NULL;
449 int err;
450
451 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
452 err = -ESRCH;
453 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
454 } else {
455 xfrm_address_t *saddr = NULL;
456
457 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
458 if (!saddr) {
459 err = -EINVAL;
460 goto out;
461 }
462
463 err = -ESRCH;
464 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
465 p->family);
466 }
467
468 out:
469 if (!x && errp)
470 *errp = err;
471 return x;
472 }
473
474 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
475 struct nlattr **attrs)
476 {
477 struct xfrm_state *x;
478 int err = -ESRCH;
479 struct km_event c;
480 struct xfrm_usersa_id *p = nlmsg_data(nlh);
481
482 x = xfrm_user_state_lookup(p, attrs, &err);
483 if (x == NULL)
484 return err;
485
486 if ((err = security_xfrm_state_delete(x)) != 0)
487 goto out;
488
489 if (xfrm_state_kern(x)) {
490 err = -EPERM;
491 goto out;
492 }
493
494 err = xfrm_state_delete(x);
495
496 if (err < 0)
497 goto out;
498
499 c.seq = nlh->nlmsg_seq;
500 c.pid = nlh->nlmsg_pid;
501 c.event = nlh->nlmsg_type;
502 km_state_notify(x, &c);
503
504 out:
505 xfrm_audit_state_delete(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
506 NETLINK_CB(skb).sid);
507 xfrm_state_put(x);
508 return err;
509 }
510
511 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
512 {
513 memcpy(&p->id, &x->id, sizeof(p->id));
514 memcpy(&p->sel, &x->sel, sizeof(p->sel));
515 memcpy(&p->lft, &x->lft, sizeof(p->lft));
516 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
517 memcpy(&p->stats, &x->stats, sizeof(p->stats));
518 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
519 p->mode = x->props.mode;
520 p->replay_window = x->props.replay_window;
521 p->reqid = x->props.reqid;
522 p->family = x->props.family;
523 p->flags = x->props.flags;
524 p->seq = x->km.seq;
525 }
526
527 struct xfrm_dump_info {
528 struct sk_buff *in_skb;
529 struct sk_buff *out_skb;
530 u32 nlmsg_seq;
531 u16 nlmsg_flags;
532 };
533
534 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
535 {
536 struct xfrm_user_sec_ctx *uctx;
537 struct nlattr *attr;
538 int ctx_size = sizeof(*uctx) + s->ctx_len;
539
540 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
541 if (attr == NULL)
542 return -EMSGSIZE;
543
544 uctx = nla_data(attr);
545 uctx->exttype = XFRMA_SEC_CTX;
546 uctx->len = ctx_size;
547 uctx->ctx_doi = s->ctx_doi;
548 uctx->ctx_alg = s->ctx_alg;
549 uctx->ctx_len = s->ctx_len;
550 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
551
552 return 0;
553 }
554
555 /* Don't change this without updating xfrm_sa_len! */
556 static int copy_to_user_state_extra(struct xfrm_state *x,
557 struct xfrm_usersa_info *p,
558 struct sk_buff *skb)
559 {
560 copy_to_user_state(x, p);
561
562 if (x->coaddr)
563 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
564
565 if (x->lastused)
566 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
567
568 if (x->aead)
569 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
570 if (x->aalg)
571 NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
572 if (x->ealg)
573 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
574 if (x->calg)
575 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
576
577 if (x->encap)
578 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
579
580 if (x->security && copy_sec_ctx(x->security, skb) < 0)
581 goto nla_put_failure;
582
583 return 0;
584
585 nla_put_failure:
586 return -EMSGSIZE;
587 }
588
589 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
590 {
591 struct xfrm_dump_info *sp = ptr;
592 struct sk_buff *in_skb = sp->in_skb;
593 struct sk_buff *skb = sp->out_skb;
594 struct xfrm_usersa_info *p;
595 struct nlmsghdr *nlh;
596 int err;
597
598 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
599 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
600 if (nlh == NULL)
601 return -EMSGSIZE;
602
603 p = nlmsg_data(nlh);
604
605 err = copy_to_user_state_extra(x, p, skb);
606 if (err)
607 goto nla_put_failure;
608
609 nlmsg_end(skb, nlh);
610 return 0;
611
612 nla_put_failure:
613 nlmsg_cancel(skb, nlh);
614 return err;
615 }
616
617 static int xfrm_dump_sa_done(struct netlink_callback *cb)
618 {
619 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
620 xfrm_state_walk_done(walk);
621 return 0;
622 }
623
624 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
625 {
626 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
627 struct xfrm_dump_info info;
628
629 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
630 sizeof(cb->args) - sizeof(cb->args[0]));
631
632 info.in_skb = cb->skb;
633 info.out_skb = skb;
634 info.nlmsg_seq = cb->nlh->nlmsg_seq;
635 info.nlmsg_flags = NLM_F_MULTI;
636
637 if (!cb->args[0]) {
638 cb->args[0] = 1;
639 xfrm_state_walk_init(walk, 0);
640 }
641
642 (void) xfrm_state_walk(walk, dump_one_state, &info);
643
644 return skb->len;
645 }
646
647 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
648 struct xfrm_state *x, u32 seq)
649 {
650 struct xfrm_dump_info info;
651 struct sk_buff *skb;
652
653 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
654 if (!skb)
655 return ERR_PTR(-ENOMEM);
656
657 info.in_skb = in_skb;
658 info.out_skb = skb;
659 info.nlmsg_seq = seq;
660 info.nlmsg_flags = 0;
661
662 if (dump_one_state(x, 0, &info)) {
663 kfree_skb(skb);
664 return NULL;
665 }
666
667 return skb;
668 }
669
670 static inline size_t xfrm_spdinfo_msgsize(void)
671 {
672 return NLMSG_ALIGN(4)
673 + nla_total_size(sizeof(struct xfrmu_spdinfo))
674 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
675 }
676
677 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
678 {
679 struct xfrmk_spdinfo si;
680 struct xfrmu_spdinfo spc;
681 struct xfrmu_spdhinfo sph;
682 struct nlmsghdr *nlh;
683 u32 *f;
684
685 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
686 if (nlh == NULL) /* shouldnt really happen ... */
687 return -EMSGSIZE;
688
689 f = nlmsg_data(nlh);
690 *f = flags;
691 xfrm_spd_getinfo(&si);
692 spc.incnt = si.incnt;
693 spc.outcnt = si.outcnt;
694 spc.fwdcnt = si.fwdcnt;
695 spc.inscnt = si.inscnt;
696 spc.outscnt = si.outscnt;
697 spc.fwdscnt = si.fwdscnt;
698 sph.spdhcnt = si.spdhcnt;
699 sph.spdhmcnt = si.spdhmcnt;
700
701 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
702 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
703
704 return nlmsg_end(skb, nlh);
705
706 nla_put_failure:
707 nlmsg_cancel(skb, nlh);
708 return -EMSGSIZE;
709 }
710
711 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
712 struct nlattr **attrs)
713 {
714 struct sk_buff *r_skb;
715 u32 *flags = nlmsg_data(nlh);
716 u32 spid = NETLINK_CB(skb).pid;
717 u32 seq = nlh->nlmsg_seq;
718
719 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
720 if (r_skb == NULL)
721 return -ENOMEM;
722
723 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
724 BUG();
725
726 return nlmsg_unicast(xfrm_nl, r_skb, spid);
727 }
728
729 static inline size_t xfrm_sadinfo_msgsize(void)
730 {
731 return NLMSG_ALIGN(4)
732 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
733 + nla_total_size(4); /* XFRMA_SAD_CNT */
734 }
735
736 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
737 {
738 struct xfrmk_sadinfo si;
739 struct xfrmu_sadhinfo sh;
740 struct nlmsghdr *nlh;
741 u32 *f;
742
743 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
744 if (nlh == NULL) /* shouldnt really happen ... */
745 return -EMSGSIZE;
746
747 f = nlmsg_data(nlh);
748 *f = flags;
749 xfrm_sad_getinfo(&si);
750
751 sh.sadhmcnt = si.sadhmcnt;
752 sh.sadhcnt = si.sadhcnt;
753
754 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
755 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
756
757 return nlmsg_end(skb, nlh);
758
759 nla_put_failure:
760 nlmsg_cancel(skb, nlh);
761 return -EMSGSIZE;
762 }
763
764 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
765 struct nlattr **attrs)
766 {
767 struct sk_buff *r_skb;
768 u32 *flags = nlmsg_data(nlh);
769 u32 spid = NETLINK_CB(skb).pid;
770 u32 seq = nlh->nlmsg_seq;
771
772 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
773 if (r_skb == NULL)
774 return -ENOMEM;
775
776 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
777 BUG();
778
779 return nlmsg_unicast(xfrm_nl, r_skb, spid);
780 }
781
782 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
783 struct nlattr **attrs)
784 {
785 struct xfrm_usersa_id *p = nlmsg_data(nlh);
786 struct xfrm_state *x;
787 struct sk_buff *resp_skb;
788 int err = -ESRCH;
789
790 x = xfrm_user_state_lookup(p, attrs, &err);
791 if (x == NULL)
792 goto out_noput;
793
794 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
795 if (IS_ERR(resp_skb)) {
796 err = PTR_ERR(resp_skb);
797 } else {
798 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
799 }
800 xfrm_state_put(x);
801 out_noput:
802 return err;
803 }
804
805 static int verify_userspi_info(struct xfrm_userspi_info *p)
806 {
807 switch (p->info.id.proto) {
808 case IPPROTO_AH:
809 case IPPROTO_ESP:
810 break;
811
812 case IPPROTO_COMP:
813 /* IPCOMP spi is 16-bits. */
814 if (p->max >= 0x10000)
815 return -EINVAL;
816 break;
817
818 default:
819 return -EINVAL;
820 }
821
822 if (p->min > p->max)
823 return -EINVAL;
824
825 return 0;
826 }
827
828 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
829 struct nlattr **attrs)
830 {
831 struct xfrm_state *x;
832 struct xfrm_userspi_info *p;
833 struct sk_buff *resp_skb;
834 xfrm_address_t *daddr;
835 int family;
836 int err;
837
838 p = nlmsg_data(nlh);
839 err = verify_userspi_info(p);
840 if (err)
841 goto out_noput;
842
843 family = p->info.family;
844 daddr = &p->info.id.daddr;
845
846 x = NULL;
847 if (p->info.seq) {
848 x = xfrm_find_acq_byseq(p->info.seq);
849 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
850 xfrm_state_put(x);
851 x = NULL;
852 }
853 }
854
855 if (!x)
856 x = xfrm_find_acq(p->info.mode, p->info.reqid,
857 p->info.id.proto, daddr,
858 &p->info.saddr, 1,
859 family);
860 err = -ENOENT;
861 if (x == NULL)
862 goto out_noput;
863
864 err = xfrm_alloc_spi(x, p->min, p->max);
865 if (err)
866 goto out;
867
868 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
869 if (IS_ERR(resp_skb)) {
870 err = PTR_ERR(resp_skb);
871 goto out;
872 }
873
874 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
875
876 out:
877 xfrm_state_put(x);
878 out_noput:
879 return err;
880 }
881
882 static int verify_policy_dir(u8 dir)
883 {
884 switch (dir) {
885 case XFRM_POLICY_IN:
886 case XFRM_POLICY_OUT:
887 case XFRM_POLICY_FWD:
888 break;
889
890 default:
891 return -EINVAL;
892 }
893
894 return 0;
895 }
896
897 static int verify_policy_type(u8 type)
898 {
899 switch (type) {
900 case XFRM_POLICY_TYPE_MAIN:
901 #ifdef CONFIG_XFRM_SUB_POLICY
902 case XFRM_POLICY_TYPE_SUB:
903 #endif
904 break;
905
906 default:
907 return -EINVAL;
908 }
909
910 return 0;
911 }
912
913 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
914 {
915 switch (p->share) {
916 case XFRM_SHARE_ANY:
917 case XFRM_SHARE_SESSION:
918 case XFRM_SHARE_USER:
919 case XFRM_SHARE_UNIQUE:
920 break;
921
922 default:
923 return -EINVAL;
924 }
925
926 switch (p->action) {
927 case XFRM_POLICY_ALLOW:
928 case XFRM_POLICY_BLOCK:
929 break;
930
931 default:
932 return -EINVAL;
933 }
934
935 switch (p->sel.family) {
936 case AF_INET:
937 break;
938
939 case AF_INET6:
940 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
941 break;
942 #else
943 return -EAFNOSUPPORT;
944 #endif
945
946 default:
947 return -EINVAL;
948 }
949
950 return verify_policy_dir(p->dir);
951 }
952
953 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
954 {
955 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
956 struct xfrm_user_sec_ctx *uctx;
957
958 if (!rt)
959 return 0;
960
961 uctx = nla_data(rt);
962 return security_xfrm_policy_alloc(&pol->security, uctx);
963 }
964
965 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
966 int nr)
967 {
968 int i;
969
970 xp->xfrm_nr = nr;
971 for (i = 0; i < nr; i++, ut++) {
972 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
973
974 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
975 memcpy(&t->saddr, &ut->saddr,
976 sizeof(xfrm_address_t));
977 t->reqid = ut->reqid;
978 t->mode = ut->mode;
979 t->share = ut->share;
980 t->optional = ut->optional;
981 t->aalgos = ut->aalgos;
982 t->ealgos = ut->ealgos;
983 t->calgos = ut->calgos;
984 /* If all masks are ~0, then we allow all algorithms. */
985 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
986 t->encap_family = ut->family;
987 }
988 }
989
990 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
991 {
992 int i;
993
994 if (nr > XFRM_MAX_DEPTH)
995 return -EINVAL;
996
997 for (i = 0; i < nr; i++) {
998 /* We never validated the ut->family value, so many
999 * applications simply leave it at zero. The check was
1000 * never made and ut->family was ignored because all
1001 * templates could be assumed to have the same family as
1002 * the policy itself. Now that we will have ipv4-in-ipv6
1003 * and ipv6-in-ipv4 tunnels, this is no longer true.
1004 */
1005 if (!ut[i].family)
1006 ut[i].family = family;
1007
1008 switch (ut[i].family) {
1009 case AF_INET:
1010 break;
1011 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1012 case AF_INET6:
1013 break;
1014 #endif
1015 default:
1016 return -EINVAL;
1017 }
1018 }
1019
1020 return 0;
1021 }
1022
1023 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1024 {
1025 struct nlattr *rt = attrs[XFRMA_TMPL];
1026
1027 if (!rt) {
1028 pol->xfrm_nr = 0;
1029 } else {
1030 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1031 int nr = nla_len(rt) / sizeof(*utmpl);
1032 int err;
1033
1034 err = validate_tmpl(nr, utmpl, pol->family);
1035 if (err)
1036 return err;
1037
1038 copy_templates(pol, utmpl, nr);
1039 }
1040 return 0;
1041 }
1042
1043 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1044 {
1045 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1046 struct xfrm_userpolicy_type *upt;
1047 u8 type = XFRM_POLICY_TYPE_MAIN;
1048 int err;
1049
1050 if (rt) {
1051 upt = nla_data(rt);
1052 type = upt->type;
1053 }
1054
1055 err = verify_policy_type(type);
1056 if (err)
1057 return err;
1058
1059 *tp = type;
1060 return 0;
1061 }
1062
1063 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1064 {
1065 xp->priority = p->priority;
1066 xp->index = p->index;
1067 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1068 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1069 xp->action = p->action;
1070 xp->flags = p->flags;
1071 xp->family = p->sel.family;
1072 /* XXX xp->share = p->share; */
1073 }
1074
1075 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1076 {
1077 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1078 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1079 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1080 p->priority = xp->priority;
1081 p->index = xp->index;
1082 p->sel.family = xp->family;
1083 p->dir = dir;
1084 p->action = xp->action;
1085 p->flags = xp->flags;
1086 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1087 }
1088
1089 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1090 {
1091 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1092 int err;
1093
1094 if (!xp) {
1095 *errp = -ENOMEM;
1096 return NULL;
1097 }
1098
1099 copy_from_user_policy(xp, p);
1100
1101 err = copy_from_user_policy_type(&xp->type, attrs);
1102 if (err)
1103 goto error;
1104
1105 if (!(err = copy_from_user_tmpl(xp, attrs)))
1106 err = copy_from_user_sec_ctx(xp, attrs);
1107 if (err)
1108 goto error;
1109
1110 return xp;
1111 error:
1112 *errp = err;
1113 xp->dead = 1;
1114 xfrm_policy_destroy(xp);
1115 return NULL;
1116 }
1117
1118 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1119 struct nlattr **attrs)
1120 {
1121 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1122 struct xfrm_policy *xp;
1123 struct km_event c;
1124 int err;
1125 int excl;
1126
1127 err = verify_newpolicy_info(p);
1128 if (err)
1129 return err;
1130 err = verify_sec_ctx_len(attrs);
1131 if (err)
1132 return err;
1133
1134 xp = xfrm_policy_construct(p, attrs, &err);
1135 if (!xp)
1136 return err;
1137
1138 /* shouldnt excl be based on nlh flags??
1139 * Aha! this is anti-netlink really i.e more pfkey derived
1140 * in netlink excl is a flag and you wouldnt need
1141 * a type XFRM_MSG_UPDPOLICY - JHS */
1142 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1143 err = xfrm_policy_insert(p->dir, xp, excl);
1144 xfrm_audit_policy_add(xp, err ? 0 : 1, NETLINK_CB(skb).loginuid,
1145 NETLINK_CB(skb).sid);
1146
1147 if (err) {
1148 security_xfrm_policy_free(xp->security);
1149 kfree(xp);
1150 return err;
1151 }
1152
1153 c.event = nlh->nlmsg_type;
1154 c.seq = nlh->nlmsg_seq;
1155 c.pid = nlh->nlmsg_pid;
1156 km_policy_notify(xp, p->dir, &c);
1157
1158 xfrm_pol_put(xp);
1159
1160 return 0;
1161 }
1162
1163 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1164 {
1165 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1166 int i;
1167
1168 if (xp->xfrm_nr == 0)
1169 return 0;
1170
1171 for (i = 0; i < xp->xfrm_nr; i++) {
1172 struct xfrm_user_tmpl *up = &vec[i];
1173 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1174
1175 memcpy(&up->id, &kp->id, sizeof(up->id));
1176 up->family = kp->encap_family;
1177 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1178 up->reqid = kp->reqid;
1179 up->mode = kp->mode;
1180 up->share = kp->share;
1181 up->optional = kp->optional;
1182 up->aalgos = kp->aalgos;
1183 up->ealgos = kp->ealgos;
1184 up->calgos = kp->calgos;
1185 }
1186
1187 return nla_put(skb, XFRMA_TMPL,
1188 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1189 }
1190
1191 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1192 {
1193 if (x->security) {
1194 return copy_sec_ctx(x->security, skb);
1195 }
1196 return 0;
1197 }
1198
1199 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1200 {
1201 if (xp->security) {
1202 return copy_sec_ctx(xp->security, skb);
1203 }
1204 return 0;
1205 }
1206 static inline size_t userpolicy_type_attrsize(void)
1207 {
1208 #ifdef CONFIG_XFRM_SUB_POLICY
1209 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1210 #else
1211 return 0;
1212 #endif
1213 }
1214
1215 #ifdef CONFIG_XFRM_SUB_POLICY
1216 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1217 {
1218 struct xfrm_userpolicy_type upt = {
1219 .type = type,
1220 };
1221
1222 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1223 }
1224
1225 #else
1226 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1227 {
1228 return 0;
1229 }
1230 #endif
1231
1232 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1233 {
1234 struct xfrm_dump_info *sp = ptr;
1235 struct xfrm_userpolicy_info *p;
1236 struct sk_buff *in_skb = sp->in_skb;
1237 struct sk_buff *skb = sp->out_skb;
1238 struct nlmsghdr *nlh;
1239
1240 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1241 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1242 if (nlh == NULL)
1243 return -EMSGSIZE;
1244
1245 p = nlmsg_data(nlh);
1246 copy_to_user_policy(xp, p, dir);
1247 if (copy_to_user_tmpl(xp, skb) < 0)
1248 goto nlmsg_failure;
1249 if (copy_to_user_sec_ctx(xp, skb))
1250 goto nlmsg_failure;
1251 if (copy_to_user_policy_type(xp->type, skb) < 0)
1252 goto nlmsg_failure;
1253
1254 nlmsg_end(skb, nlh);
1255 return 0;
1256
1257 nlmsg_failure:
1258 nlmsg_cancel(skb, nlh);
1259 return -EMSGSIZE;
1260 }
1261
1262 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1263 {
1264 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1265
1266 xfrm_policy_walk_done(walk);
1267 return 0;
1268 }
1269
1270 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1271 {
1272 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1273 struct xfrm_dump_info info;
1274
1275 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1276 sizeof(cb->args) - sizeof(cb->args[0]));
1277
1278 info.in_skb = cb->skb;
1279 info.out_skb = skb;
1280 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1281 info.nlmsg_flags = NLM_F_MULTI;
1282
1283 if (!cb->args[0]) {
1284 cb->args[0] = 1;
1285 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1286 }
1287
1288 (void) xfrm_policy_walk(walk, dump_one_policy, &info);
1289
1290 return skb->len;
1291 }
1292
1293 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1294 struct xfrm_policy *xp,
1295 int dir, u32 seq)
1296 {
1297 struct xfrm_dump_info info;
1298 struct sk_buff *skb;
1299
1300 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1301 if (!skb)
1302 return ERR_PTR(-ENOMEM);
1303
1304 info.in_skb = in_skb;
1305 info.out_skb = skb;
1306 info.nlmsg_seq = seq;
1307 info.nlmsg_flags = 0;
1308
1309 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1310 kfree_skb(skb);
1311 return NULL;
1312 }
1313
1314 return skb;
1315 }
1316
1317 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1318 struct nlattr **attrs)
1319 {
1320 struct xfrm_policy *xp;
1321 struct xfrm_userpolicy_id *p;
1322 u8 type = XFRM_POLICY_TYPE_MAIN;
1323 int err;
1324 struct km_event c;
1325 int delete;
1326
1327 p = nlmsg_data(nlh);
1328 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1329
1330 err = copy_from_user_policy_type(&type, attrs);
1331 if (err)
1332 return err;
1333
1334 err = verify_policy_dir(p->dir);
1335 if (err)
1336 return err;
1337
1338 if (p->index)
1339 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1340 else {
1341 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1342 struct xfrm_sec_ctx *ctx;
1343
1344 err = verify_sec_ctx_len(attrs);
1345 if (err)
1346 return err;
1347
1348 ctx = NULL;
1349 if (rt) {
1350 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1351
1352 err = security_xfrm_policy_alloc(&ctx, uctx);
1353 if (err)
1354 return err;
1355 }
1356 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx,
1357 delete, &err);
1358 security_xfrm_policy_free(ctx);
1359 }
1360 if (xp == NULL)
1361 return -ENOENT;
1362
1363 if (!delete) {
1364 struct sk_buff *resp_skb;
1365
1366 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1367 if (IS_ERR(resp_skb)) {
1368 err = PTR_ERR(resp_skb);
1369 } else {
1370 err = nlmsg_unicast(xfrm_nl, resp_skb,
1371 NETLINK_CB(skb).pid);
1372 }
1373 } else {
1374 xfrm_audit_policy_delete(xp, err ? 0 : 1,
1375 NETLINK_CB(skb).loginuid,
1376 NETLINK_CB(skb).sid);
1377
1378 if (err != 0)
1379 goto out;
1380
1381 c.data.byid = p->index;
1382 c.event = nlh->nlmsg_type;
1383 c.seq = nlh->nlmsg_seq;
1384 c.pid = nlh->nlmsg_pid;
1385 km_policy_notify(xp, p->dir, &c);
1386 }
1387
1388 out:
1389 xfrm_pol_put(xp);
1390 return err;
1391 }
1392
1393 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1394 struct nlattr **attrs)
1395 {
1396 struct km_event c;
1397 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1398 struct xfrm_audit audit_info;
1399 int err;
1400
1401 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1402 audit_info.secid = NETLINK_CB(skb).sid;
1403 err = xfrm_state_flush(p->proto, &audit_info);
1404 if (err)
1405 return err;
1406 c.data.proto = p->proto;
1407 c.event = nlh->nlmsg_type;
1408 c.seq = nlh->nlmsg_seq;
1409 c.pid = nlh->nlmsg_pid;
1410 km_state_notify(NULL, &c);
1411
1412 return 0;
1413 }
1414
1415 static inline size_t xfrm_aevent_msgsize(void)
1416 {
1417 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1418 + nla_total_size(sizeof(struct xfrm_replay_state))
1419 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1420 + nla_total_size(4) /* XFRM_AE_RTHR */
1421 + nla_total_size(4); /* XFRM_AE_ETHR */
1422 }
1423
1424 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1425 {
1426 struct xfrm_aevent_id *id;
1427 struct nlmsghdr *nlh;
1428
1429 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1430 if (nlh == NULL)
1431 return -EMSGSIZE;
1432
1433 id = nlmsg_data(nlh);
1434 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1435 id->sa_id.spi = x->id.spi;
1436 id->sa_id.family = x->props.family;
1437 id->sa_id.proto = x->id.proto;
1438 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1439 id->reqid = x->props.reqid;
1440 id->flags = c->data.aevent;
1441
1442 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1443 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1444
1445 if (id->flags & XFRM_AE_RTHR)
1446 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1447
1448 if (id->flags & XFRM_AE_ETHR)
1449 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1450 x->replay_maxage * 10 / HZ);
1451
1452 return nlmsg_end(skb, nlh);
1453
1454 nla_put_failure:
1455 nlmsg_cancel(skb, nlh);
1456 return -EMSGSIZE;
1457 }
1458
1459 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1460 struct nlattr **attrs)
1461 {
1462 struct xfrm_state *x;
1463 struct sk_buff *r_skb;
1464 int err;
1465 struct km_event c;
1466 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1467 struct xfrm_usersa_id *id = &p->sa_id;
1468
1469 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1470 if (r_skb == NULL)
1471 return -ENOMEM;
1472
1473 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1474 if (x == NULL) {
1475 kfree_skb(r_skb);
1476 return -ESRCH;
1477 }
1478
1479 /*
1480 * XXX: is this lock really needed - none of the other
1481 * gets lock (the concern is things getting updated
1482 * while we are still reading) - jhs
1483 */
1484 spin_lock_bh(&x->lock);
1485 c.data.aevent = p->flags;
1486 c.seq = nlh->nlmsg_seq;
1487 c.pid = nlh->nlmsg_pid;
1488
1489 if (build_aevent(r_skb, x, &c) < 0)
1490 BUG();
1491 err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
1492 spin_unlock_bh(&x->lock);
1493 xfrm_state_put(x);
1494 return err;
1495 }
1496
1497 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1498 struct nlattr **attrs)
1499 {
1500 struct xfrm_state *x;
1501 struct km_event c;
1502 int err = - EINVAL;
1503 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1504 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1505 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1506
1507 if (!lt && !rp)
1508 return err;
1509
1510 /* pedantic mode - thou shalt sayeth replaceth */
1511 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1512 return err;
1513
1514 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1515 if (x == NULL)
1516 return -ESRCH;
1517
1518 if (x->km.state != XFRM_STATE_VALID)
1519 goto out;
1520
1521 spin_lock_bh(&x->lock);
1522 xfrm_update_ae_params(x, attrs);
1523 spin_unlock_bh(&x->lock);
1524
1525 c.event = nlh->nlmsg_type;
1526 c.seq = nlh->nlmsg_seq;
1527 c.pid = nlh->nlmsg_pid;
1528 c.data.aevent = XFRM_AE_CU;
1529 km_state_notify(x, &c);
1530 err = 0;
1531 out:
1532 xfrm_state_put(x);
1533 return err;
1534 }
1535
1536 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1537 struct nlattr **attrs)
1538 {
1539 struct km_event c;
1540 u8 type = XFRM_POLICY_TYPE_MAIN;
1541 int err;
1542 struct xfrm_audit audit_info;
1543
1544 err = copy_from_user_policy_type(&type, attrs);
1545 if (err)
1546 return err;
1547
1548 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1549 audit_info.secid = NETLINK_CB(skb).sid;
1550 err = xfrm_policy_flush(type, &audit_info);
1551 if (err)
1552 return err;
1553 c.data.type = type;
1554 c.event = nlh->nlmsg_type;
1555 c.seq = nlh->nlmsg_seq;
1556 c.pid = nlh->nlmsg_pid;
1557 km_policy_notify(NULL, 0, &c);
1558 return 0;
1559 }
1560
1561 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1562 struct nlattr **attrs)
1563 {
1564 struct xfrm_policy *xp;
1565 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1566 struct xfrm_userpolicy_info *p = &up->pol;
1567 u8 type = XFRM_POLICY_TYPE_MAIN;
1568 int err = -ENOENT;
1569
1570 err = copy_from_user_policy_type(&type, attrs);
1571 if (err)
1572 return err;
1573
1574 if (p->index)
1575 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1576 else {
1577 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1578 struct xfrm_sec_ctx *ctx;
1579
1580 err = verify_sec_ctx_len(attrs);
1581 if (err)
1582 return err;
1583
1584 ctx = NULL;
1585 if (rt) {
1586 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1587
1588 err = security_xfrm_policy_alloc(&ctx, uctx);
1589 if (err)
1590 return err;
1591 }
1592 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx, 0, &err);
1593 security_xfrm_policy_free(ctx);
1594 }
1595 if (xp == NULL)
1596 return -ENOENT;
1597
1598 read_lock(&xp->lock);
1599 if (xp->dead) {
1600 read_unlock(&xp->lock);
1601 goto out;
1602 }
1603
1604 read_unlock(&xp->lock);
1605 err = 0;
1606 if (up->hard) {
1607 xfrm_policy_delete(xp, p->dir);
1608 xfrm_audit_policy_delete(xp, 1, NETLINK_CB(skb).loginuid,
1609 NETLINK_CB(skb).sid);
1610
1611 } else {
1612 // reset the timers here?
1613 printk("Dont know what to do with soft policy expire\n");
1614 }
1615 km_policy_expired(xp, p->dir, up->hard, current->pid);
1616
1617 out:
1618 xfrm_pol_put(xp);
1619 return err;
1620 }
1621
1622 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1623 struct nlattr **attrs)
1624 {
1625 struct xfrm_state *x;
1626 int err;
1627 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1628 struct xfrm_usersa_info *p = &ue->state;
1629
1630 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1631
1632 err = -ENOENT;
1633 if (x == NULL)
1634 return err;
1635
1636 spin_lock_bh(&x->lock);
1637 err = -EINVAL;
1638 if (x->km.state != XFRM_STATE_VALID)
1639 goto out;
1640 km_state_expired(x, ue->hard, current->pid);
1641
1642 if (ue->hard) {
1643 __xfrm_state_delete(x);
1644 xfrm_audit_state_delete(x, 1, NETLINK_CB(skb).loginuid,
1645 NETLINK_CB(skb).sid);
1646 }
1647 err = 0;
1648 out:
1649 spin_unlock_bh(&x->lock);
1650 xfrm_state_put(x);
1651 return err;
1652 }
1653
1654 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1655 struct nlattr **attrs)
1656 {
1657 struct xfrm_policy *xp;
1658 struct xfrm_user_tmpl *ut;
1659 int i;
1660 struct nlattr *rt = attrs[XFRMA_TMPL];
1661
1662 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1663 struct xfrm_state *x = xfrm_state_alloc();
1664 int err = -ENOMEM;
1665
1666 if (!x)
1667 return err;
1668
1669 err = verify_newpolicy_info(&ua->policy);
1670 if (err) {
1671 printk("BAD policy passed\n");
1672 kfree(x);
1673 return err;
1674 }
1675
1676 /* build an XP */
1677 xp = xfrm_policy_construct(&ua->policy, attrs, &err);
1678 if (!xp) {
1679 kfree(x);
1680 return err;
1681 }
1682
1683 memcpy(&x->id, &ua->id, sizeof(ua->id));
1684 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1685 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1686
1687 ut = nla_data(rt);
1688 /* extract the templates and for each call km_key */
1689 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1690 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1691 memcpy(&x->id, &t->id, sizeof(x->id));
1692 x->props.mode = t->mode;
1693 x->props.reqid = t->reqid;
1694 x->props.family = ut->family;
1695 t->aalgos = ua->aalgos;
1696 t->ealgos = ua->ealgos;
1697 t->calgos = ua->calgos;
1698 err = km_query(x, t, xp);
1699
1700 }
1701
1702 kfree(x);
1703 kfree(xp);
1704
1705 return 0;
1706 }
1707
1708 #ifdef CONFIG_XFRM_MIGRATE
1709 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1710 struct nlattr **attrs, int *num)
1711 {
1712 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1713 struct xfrm_user_migrate *um;
1714 int i, num_migrate;
1715
1716 um = nla_data(rt);
1717 num_migrate = nla_len(rt) / sizeof(*um);
1718
1719 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1720 return -EINVAL;
1721
1722 for (i = 0; i < num_migrate; i++, um++, ma++) {
1723 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1724 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1725 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1726 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1727
1728 ma->proto = um->proto;
1729 ma->mode = um->mode;
1730 ma->reqid = um->reqid;
1731
1732 ma->old_family = um->old_family;
1733 ma->new_family = um->new_family;
1734 }
1735
1736 *num = i;
1737 return 0;
1738 }
1739
1740 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1741 struct nlattr **attrs)
1742 {
1743 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1744 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1745 u8 type;
1746 int err;
1747 int n = 0;
1748
1749 if (attrs[XFRMA_MIGRATE] == NULL)
1750 return -EINVAL;
1751
1752 err = copy_from_user_policy_type(&type, attrs);
1753 if (err)
1754 return err;
1755
1756 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1757 attrs, &n);
1758 if (err)
1759 return err;
1760
1761 if (!n)
1762 return 0;
1763
1764 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1765
1766 return 0;
1767 }
1768 #else
1769 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1770 struct nlattr **attrs)
1771 {
1772 return -ENOPROTOOPT;
1773 }
1774 #endif
1775
1776 #ifdef CONFIG_XFRM_MIGRATE
1777 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1778 {
1779 struct xfrm_user_migrate um;
1780
1781 memset(&um, 0, sizeof(um));
1782 um.proto = m->proto;
1783 um.mode = m->mode;
1784 um.reqid = m->reqid;
1785 um.old_family = m->old_family;
1786 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1787 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1788 um.new_family = m->new_family;
1789 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1790 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1791
1792 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1793 }
1794
1795 static inline size_t xfrm_migrate_msgsize(int num_migrate)
1796 {
1797 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1798 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1799 + userpolicy_type_attrsize();
1800 }
1801
1802 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1803 int num_migrate, struct xfrm_selector *sel,
1804 u8 dir, u8 type)
1805 {
1806 struct xfrm_migrate *mp;
1807 struct xfrm_userpolicy_id *pol_id;
1808 struct nlmsghdr *nlh;
1809 int i;
1810
1811 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1812 if (nlh == NULL)
1813 return -EMSGSIZE;
1814
1815 pol_id = nlmsg_data(nlh);
1816 /* copy data from selector, dir, and type to the pol_id */
1817 memset(pol_id, 0, sizeof(*pol_id));
1818 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1819 pol_id->dir = dir;
1820
1821 if (copy_to_user_policy_type(type, skb) < 0)
1822 goto nlmsg_failure;
1823
1824 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1825 if (copy_to_user_migrate(mp, skb) < 0)
1826 goto nlmsg_failure;
1827 }
1828
1829 return nlmsg_end(skb, nlh);
1830 nlmsg_failure:
1831 nlmsg_cancel(skb, nlh);
1832 return -EMSGSIZE;
1833 }
1834
1835 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1836 struct xfrm_migrate *m, int num_migrate)
1837 {
1838 struct sk_buff *skb;
1839
1840 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
1841 if (skb == NULL)
1842 return -ENOMEM;
1843
1844 /* build migrate */
1845 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1846 BUG();
1847
1848 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
1849 }
1850 #else
1851 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1852 struct xfrm_migrate *m, int num_migrate)
1853 {
1854 return -ENOPROTOOPT;
1855 }
1856 #endif
1857
1858 #define XMSGSIZE(type) sizeof(struct type)
1859
1860 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1861 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1862 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1863 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1864 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1865 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1866 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1867 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1868 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1869 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1870 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1871 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1872 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1873 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1874 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
1875 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1876 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1877 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1878 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1879 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
1880 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1881 };
1882
1883 #undef XMSGSIZE
1884
1885 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1886 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
1887 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
1888 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
1889 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
1890 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
1891 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
1892 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
1893 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
1894 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
1895 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
1896 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
1897 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
1898 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
1899 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
1900 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
1901 };
1902
1903 static struct xfrm_link {
1904 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1905 int (*dump)(struct sk_buff *, struct netlink_callback *);
1906 int (*done)(struct netlink_callback *);
1907 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1908 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1909 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1910 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1911 .dump = xfrm_dump_sa,
1912 .done = xfrm_dump_sa_done },
1913 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1914 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1915 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1916 .dump = xfrm_dump_policy,
1917 .done = xfrm_dump_policy_done },
1918 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1919 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1920 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1921 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1922 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1923 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1924 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1925 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1926 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1927 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1928 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1929 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1930 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1931 };
1932
1933 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1934 {
1935 struct nlattr *attrs[XFRMA_MAX+1];
1936 struct xfrm_link *link;
1937 int type, err;
1938
1939 type = nlh->nlmsg_type;
1940 if (type > XFRM_MSG_MAX)
1941 return -EINVAL;
1942
1943 type -= XFRM_MSG_BASE;
1944 link = &xfrm_dispatch[type];
1945
1946 /* All operations require privileges, even GET */
1947 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1948 return -EPERM;
1949
1950 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1951 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1952 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1953 if (link->dump == NULL)
1954 return -EINVAL;
1955
1956 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, link->done);
1957 }
1958
1959 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
1960 xfrma_policy);
1961 if (err < 0)
1962 return err;
1963
1964 if (link->doit == NULL)
1965 return -EINVAL;
1966
1967 return link->doit(skb, nlh, attrs);
1968 }
1969
1970 static void xfrm_netlink_rcv(struct sk_buff *skb)
1971 {
1972 mutex_lock(&xfrm_cfg_mutex);
1973 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
1974 mutex_unlock(&xfrm_cfg_mutex);
1975 }
1976
1977 static inline size_t xfrm_expire_msgsize(void)
1978 {
1979 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
1980 }
1981
1982 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1983 {
1984 struct xfrm_user_expire *ue;
1985 struct nlmsghdr *nlh;
1986
1987 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
1988 if (nlh == NULL)
1989 return -EMSGSIZE;
1990
1991 ue = nlmsg_data(nlh);
1992 copy_to_user_state(x, &ue->state);
1993 ue->hard = (c->data.hard != 0) ? 1 : 0;
1994
1995 return nlmsg_end(skb, nlh);
1996 }
1997
1998 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1999 {
2000 struct sk_buff *skb;
2001
2002 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2003 if (skb == NULL)
2004 return -ENOMEM;
2005
2006 if (build_expire(skb, x, c) < 0)
2007 BUG();
2008
2009 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2010 }
2011
2012 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2013 {
2014 struct sk_buff *skb;
2015
2016 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2017 if (skb == NULL)
2018 return -ENOMEM;
2019
2020 if (build_aevent(skb, x, c) < 0)
2021 BUG();
2022
2023 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2024 }
2025
2026 static int xfrm_notify_sa_flush(struct km_event *c)
2027 {
2028 struct xfrm_usersa_flush *p;
2029 struct nlmsghdr *nlh;
2030 struct sk_buff *skb;
2031 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2032
2033 skb = nlmsg_new(len, GFP_ATOMIC);
2034 if (skb == NULL)
2035 return -ENOMEM;
2036
2037 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2038 if (nlh == NULL) {
2039 kfree_skb(skb);
2040 return -EMSGSIZE;
2041 }
2042
2043 p = nlmsg_data(nlh);
2044 p->proto = c->data.proto;
2045
2046 nlmsg_end(skb, nlh);
2047
2048 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2049 }
2050
2051 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2052 {
2053 size_t l = 0;
2054 if (x->aead)
2055 l += nla_total_size(aead_len(x->aead));
2056 if (x->aalg)
2057 l += nla_total_size(xfrm_alg_len(x->aalg));
2058 if (x->ealg)
2059 l += nla_total_size(xfrm_alg_len(x->ealg));
2060 if (x->calg)
2061 l += nla_total_size(sizeof(*x->calg));
2062 if (x->encap)
2063 l += nla_total_size(sizeof(*x->encap));
2064 if (x->security)
2065 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2066 x->security->ctx_len);
2067 if (x->coaddr)
2068 l += nla_total_size(sizeof(*x->coaddr));
2069
2070 /* Must count x->lastused as it may become non-zero behind our back. */
2071 l += nla_total_size(sizeof(u64));
2072
2073 return l;
2074 }
2075
2076 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2077 {
2078 struct xfrm_usersa_info *p;
2079 struct xfrm_usersa_id *id;
2080 struct nlmsghdr *nlh;
2081 struct sk_buff *skb;
2082 int len = xfrm_sa_len(x);
2083 int headlen;
2084
2085 headlen = sizeof(*p);
2086 if (c->event == XFRM_MSG_DELSA) {
2087 len += nla_total_size(headlen);
2088 headlen = sizeof(*id);
2089 }
2090 len += NLMSG_ALIGN(headlen);
2091
2092 skb = nlmsg_new(len, GFP_ATOMIC);
2093 if (skb == NULL)
2094 return -ENOMEM;
2095
2096 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2097 if (nlh == NULL)
2098 goto nla_put_failure;
2099
2100 p = nlmsg_data(nlh);
2101 if (c->event == XFRM_MSG_DELSA) {
2102 struct nlattr *attr;
2103
2104 id = nlmsg_data(nlh);
2105 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2106 id->spi = x->id.spi;
2107 id->family = x->props.family;
2108 id->proto = x->id.proto;
2109
2110 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2111 if (attr == NULL)
2112 goto nla_put_failure;
2113
2114 p = nla_data(attr);
2115 }
2116
2117 if (copy_to_user_state_extra(x, p, skb))
2118 goto nla_put_failure;
2119
2120 nlmsg_end(skb, nlh);
2121
2122 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2123
2124 nla_put_failure:
2125 /* Somebody screwed up with xfrm_sa_len! */
2126 WARN_ON(1);
2127 kfree_skb(skb);
2128 return -1;
2129 }
2130
2131 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2132 {
2133
2134 switch (c->event) {
2135 case XFRM_MSG_EXPIRE:
2136 return xfrm_exp_state_notify(x, c);
2137 case XFRM_MSG_NEWAE:
2138 return xfrm_aevent_state_notify(x, c);
2139 case XFRM_MSG_DELSA:
2140 case XFRM_MSG_UPDSA:
2141 case XFRM_MSG_NEWSA:
2142 return xfrm_notify_sa(x, c);
2143 case XFRM_MSG_FLUSHSA:
2144 return xfrm_notify_sa_flush(c);
2145 default:
2146 printk("xfrm_user: Unknown SA event %d\n", c->event);
2147 break;
2148 }
2149
2150 return 0;
2151
2152 }
2153
2154 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2155 struct xfrm_policy *xp)
2156 {
2157 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2158 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2159 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2160 + userpolicy_type_attrsize();
2161 }
2162
2163 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2164 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2165 int dir)
2166 {
2167 struct xfrm_user_acquire *ua;
2168 struct nlmsghdr *nlh;
2169 __u32 seq = xfrm_get_acqseq();
2170
2171 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2172 if (nlh == NULL)
2173 return -EMSGSIZE;
2174
2175 ua = nlmsg_data(nlh);
2176 memcpy(&ua->id, &x->id, sizeof(ua->id));
2177 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2178 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2179 copy_to_user_policy(xp, &ua->policy, dir);
2180 ua->aalgos = xt->aalgos;
2181 ua->ealgos = xt->ealgos;
2182 ua->calgos = xt->calgos;
2183 ua->seq = x->km.seq = seq;
2184
2185 if (copy_to_user_tmpl(xp, skb) < 0)
2186 goto nlmsg_failure;
2187 if (copy_to_user_state_sec_ctx(x, skb))
2188 goto nlmsg_failure;
2189 if (copy_to_user_policy_type(xp->type, skb) < 0)
2190 goto nlmsg_failure;
2191
2192 return nlmsg_end(skb, nlh);
2193
2194 nlmsg_failure:
2195 nlmsg_cancel(skb, nlh);
2196 return -EMSGSIZE;
2197 }
2198
2199 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2200 struct xfrm_policy *xp, int dir)
2201 {
2202 struct sk_buff *skb;
2203
2204 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2205 if (skb == NULL)
2206 return -ENOMEM;
2207
2208 if (build_acquire(skb, x, xt, xp, dir) < 0)
2209 BUG();
2210
2211 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2212 }
2213
2214 /* User gives us xfrm_user_policy_info followed by an array of 0
2215 * or more templates.
2216 */
2217 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2218 u8 *data, int len, int *dir)
2219 {
2220 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2221 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2222 struct xfrm_policy *xp;
2223 int nr;
2224
2225 switch (sk->sk_family) {
2226 case AF_INET:
2227 if (opt != IP_XFRM_POLICY) {
2228 *dir = -EOPNOTSUPP;
2229 return NULL;
2230 }
2231 break;
2232 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2233 case AF_INET6:
2234 if (opt != IPV6_XFRM_POLICY) {
2235 *dir = -EOPNOTSUPP;
2236 return NULL;
2237 }
2238 break;
2239 #endif
2240 default:
2241 *dir = -EINVAL;
2242 return NULL;
2243 }
2244
2245 *dir = -EINVAL;
2246
2247 if (len < sizeof(*p) ||
2248 verify_newpolicy_info(p))
2249 return NULL;
2250
2251 nr = ((len - sizeof(*p)) / sizeof(*ut));
2252 if (validate_tmpl(nr, ut, p->sel.family))
2253 return NULL;
2254
2255 if (p->dir > XFRM_POLICY_OUT)
2256 return NULL;
2257
2258 xp = xfrm_policy_alloc(GFP_KERNEL);
2259 if (xp == NULL) {
2260 *dir = -ENOBUFS;
2261 return NULL;
2262 }
2263
2264 copy_from_user_policy(xp, p);
2265 xp->type = XFRM_POLICY_TYPE_MAIN;
2266 copy_templates(xp, ut, nr);
2267
2268 *dir = p->dir;
2269
2270 return xp;
2271 }
2272
2273 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2274 {
2275 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2276 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2277 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2278 + userpolicy_type_attrsize();
2279 }
2280
2281 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2282 int dir, struct km_event *c)
2283 {
2284 struct xfrm_user_polexpire *upe;
2285 struct nlmsghdr *nlh;
2286 int hard = c->data.hard;
2287
2288 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2289 if (nlh == NULL)
2290 return -EMSGSIZE;
2291
2292 upe = nlmsg_data(nlh);
2293 copy_to_user_policy(xp, &upe->pol, dir);
2294 if (copy_to_user_tmpl(xp, skb) < 0)
2295 goto nlmsg_failure;
2296 if (copy_to_user_sec_ctx(xp, skb))
2297 goto nlmsg_failure;
2298 if (copy_to_user_policy_type(xp->type, skb) < 0)
2299 goto nlmsg_failure;
2300 upe->hard = !!hard;
2301
2302 return nlmsg_end(skb, nlh);
2303
2304 nlmsg_failure:
2305 nlmsg_cancel(skb, nlh);
2306 return -EMSGSIZE;
2307 }
2308
2309 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2310 {
2311 struct sk_buff *skb;
2312
2313 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2314 if (skb == NULL)
2315 return -ENOMEM;
2316
2317 if (build_polexpire(skb, xp, dir, c) < 0)
2318 BUG();
2319
2320 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2321 }
2322
2323 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2324 {
2325 struct xfrm_userpolicy_info *p;
2326 struct xfrm_userpolicy_id *id;
2327 struct nlmsghdr *nlh;
2328 struct sk_buff *skb;
2329 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2330 int headlen;
2331
2332 headlen = sizeof(*p);
2333 if (c->event == XFRM_MSG_DELPOLICY) {
2334 len += nla_total_size(headlen);
2335 headlen = sizeof(*id);
2336 }
2337 len += userpolicy_type_attrsize();
2338 len += NLMSG_ALIGN(headlen);
2339
2340 skb = nlmsg_new(len, GFP_ATOMIC);
2341 if (skb == NULL)
2342 return -ENOMEM;
2343
2344 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2345 if (nlh == NULL)
2346 goto nlmsg_failure;
2347
2348 p = nlmsg_data(nlh);
2349 if (c->event == XFRM_MSG_DELPOLICY) {
2350 struct nlattr *attr;
2351
2352 id = nlmsg_data(nlh);
2353 memset(id, 0, sizeof(*id));
2354 id->dir = dir;
2355 if (c->data.byid)
2356 id->index = xp->index;
2357 else
2358 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2359
2360 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2361 if (attr == NULL)
2362 goto nlmsg_failure;
2363
2364 p = nla_data(attr);
2365 }
2366
2367 copy_to_user_policy(xp, p, dir);
2368 if (copy_to_user_tmpl(xp, skb) < 0)
2369 goto nlmsg_failure;
2370 if (copy_to_user_policy_type(xp->type, skb) < 0)
2371 goto nlmsg_failure;
2372
2373 nlmsg_end(skb, nlh);
2374
2375 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2376
2377 nlmsg_failure:
2378 kfree_skb(skb);
2379 return -1;
2380 }
2381
2382 static int xfrm_notify_policy_flush(struct km_event *c)
2383 {
2384 struct nlmsghdr *nlh;
2385 struct sk_buff *skb;
2386
2387 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2388 if (skb == NULL)
2389 return -ENOMEM;
2390
2391 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2392 if (nlh == NULL)
2393 goto nlmsg_failure;
2394 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2395 goto nlmsg_failure;
2396
2397 nlmsg_end(skb, nlh);
2398
2399 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2400
2401 nlmsg_failure:
2402 kfree_skb(skb);
2403 return -1;
2404 }
2405
2406 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2407 {
2408
2409 switch (c->event) {
2410 case XFRM_MSG_NEWPOLICY:
2411 case XFRM_MSG_UPDPOLICY:
2412 case XFRM_MSG_DELPOLICY:
2413 return xfrm_notify_policy(xp, dir, c);
2414 case XFRM_MSG_FLUSHPOLICY:
2415 return xfrm_notify_policy_flush(c);
2416 case XFRM_MSG_POLEXPIRE:
2417 return xfrm_exp_policy_notify(xp, dir, c);
2418 default:
2419 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2420 }
2421
2422 return 0;
2423
2424 }
2425
2426 static inline size_t xfrm_report_msgsize(void)
2427 {
2428 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2429 }
2430
2431 static int build_report(struct sk_buff *skb, u8 proto,
2432 struct xfrm_selector *sel, xfrm_address_t *addr)
2433 {
2434 struct xfrm_user_report *ur;
2435 struct nlmsghdr *nlh;
2436
2437 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2438 if (nlh == NULL)
2439 return -EMSGSIZE;
2440
2441 ur = nlmsg_data(nlh);
2442 ur->proto = proto;
2443 memcpy(&ur->sel, sel, sizeof(ur->sel));
2444
2445 if (addr)
2446 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2447
2448 return nlmsg_end(skb, nlh);
2449
2450 nla_put_failure:
2451 nlmsg_cancel(skb, nlh);
2452 return -EMSGSIZE;
2453 }
2454
2455 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2456 xfrm_address_t *addr)
2457 {
2458 struct sk_buff *skb;
2459
2460 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2461 if (skb == NULL)
2462 return -ENOMEM;
2463
2464 if (build_report(skb, proto, sel, addr) < 0)
2465 BUG();
2466
2467 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2468 }
2469
2470 static struct xfrm_mgr netlink_mgr = {
2471 .id = "netlink",
2472 .notify = xfrm_send_state_notify,
2473 .acquire = xfrm_send_acquire,
2474 .compile_policy = xfrm_compile_policy,
2475 .notify_policy = xfrm_send_policy_notify,
2476 .report = xfrm_send_report,
2477 .migrate = xfrm_send_migrate,
2478 };
2479
2480 static int __init xfrm_user_init(void)
2481 {
2482 struct sock *nlsk;
2483
2484 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2485
2486 nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
2487 xfrm_netlink_rcv, NULL, THIS_MODULE);
2488 if (nlsk == NULL)
2489 return -ENOMEM;
2490 rcu_assign_pointer(xfrm_nl, nlsk);
2491
2492 xfrm_register_km(&netlink_mgr);
2493
2494 return 0;
2495 }
2496
2497 static void __exit xfrm_user_exit(void)
2498 {
2499 struct sock *nlsk = xfrm_nl;
2500
2501 xfrm_unregister_km(&netlink_mgr);
2502 rcu_assign_pointer(xfrm_nl, NULL);
2503 synchronize_rcu();
2504 netlink_kernel_release(nlsk);
2505 }
2506
2507 module_init(xfrm_user_init);
2508 module_exit(xfrm_user_exit);
2509 MODULE_LICENSE("GPL");
2510 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2511
Log-structured file system for Linux